Yeah, these are the dust boots for the actual pistons not the pins. Actually, my calipers are fixed calipers, so they don't have the floating pins. These boots aren't really expandable at all either. They aren't the kind that you slide into piston housing to keep them in place. Instead they slide over a ridge just above the level of the piston housing They have a solid metal wire built into them, and the boot can only expand as wide as the wire. It's not like the ones that come with the clip that is cut to allow it to be spread apart and adjusted to a different size depending on how much or little you bend the clip.

I'm beginning to really think that these boots just can't be fit to it. I basically made a home made version of a seal press, and it made no difference.